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Raman optical fiber distributed temperature sensor using wavelet transform based simplified signal processing of Raman backscattered signals

机译：拉曼光纤分布式温度传感器，基于小波变换的拉曼背散射信号简化信号处理

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摘要

A Raman optical fiber distributed temperature sensor, using a wavelet transform based signal processing technique for backscattered anti-Stokes and Stokes signals, is presented. This technique mainly performs two functions. First, it equalizes the wavelength dependent optical fiber attenuation of two Raman backscattered signals and second, denoises these Raman signals without generating any appreciable spatial inaccuracy in locating the hot zones. The proposed technique enables automatic measurement of distributed temperature profile that has better temperature accuracy and very small spatial error in detecting the location of hot zones. The accuracy achieved in temperature measurement with processed Raman signals is much better than the accuracy obtained with unprocessed signals. Results show a maximum temperature error of +/-3.5 degrees C in a temperature range of 25-295 degrees C and a maximum spatial error of +/-3 cm in locating the hot zones over a sensing length of 205 m with spatial resolution of 1 m. The proposed technique has been used for the development of a prototype Raman optical fiber distributed temperature sensor (ROFDTS) system which employs 200/220 mu m Polyimide coated Multi-mode optical fiber. The technique is much simpler compared to other complex techniques described in the literature and is suitable for general temperature sensing applications. The technique supports automatic and dynamic self-calibration of ROFDTS to take care of slow variations/drifts in the observed Raman signals which are due to fluctuations in laser power and laser-fiber coupling. A self-calibration setup has also been developed to track the changes in the temperature of calibration zone. (C) 2014 Elsevier Ltd. All rights reserved.
机译：提出了一种拉曼光纤分布式温度传感器，该传感器使用基于小波变换的信号处理技术来反向散射反斯托克斯信号和斯托克斯信号。该技术主要执行两个功能。首先，它使两个拉曼反向散射信号的与波长有关的光纤衰减相等，其次，对这些拉曼信号进行消噪，而不会在定位热区时产生任何明显的空间误差。所提出的技术使得能够自动测量分布式温度曲线，从而在检测热区的位置时具有更好的温度精度和非常小的空间误差。用已处理的拉曼信号进行温度测量的精度要比未处理的信号获得的精度好得多。结果显示，在25-295摄氏度的温度范围内，最大温度误差为+/- 3.5摄氏度，在205 m的感应长度上定位热区时的最大空间误差为+/- 3厘米，空间分辨率为1米所提出的技术已用于开发原型拉曼光纤分布式温度传感器（ROFDTS）系统，该系统采用200/220μm聚酰亚胺涂层的多模光纤。与文献中描述的其他复杂技术相比，该技术简单得多，并且适用于一般温度感测应用。该技术支持ROFDTS的自动和动态自校准，以照顾观察到的拉曼信号的缓慢变化/漂移，这是由于激光功率和激光-光纤耦合的波动所致。还开发了一种自校准设置来跟踪校准区域温度的变化。 （C）2014 Elsevier Ltd.保留所有权利。

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